import java.awt.Graphics;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class Shapes extends JPanel
{
    public void paint(Graphics g)
    {
        super.paint(g);
        for (int i = 0; i < 12; i++)
        {
            g.drawOval(25+5*i, 25+5*i, 150-10*i, 150-10*i);
        }
    }
}
